I can´t find my pram battery on my macbook logic board 820-2279-a.
iFixit doesn't show my particular Logic board.
If someone could post a picture I'd really appreciate it.
Use this guide for your PRAM. Apple moved the PRAM from under the logic board (where it was in Core Duo and Core 2 Duo) to near the right speaker (where it is in Santa Rosa, Penryn, and Early/Mid 2009). There is as cutout in these cases for the new location of the PRAM.